<template>
  <div>
    <h1>当前求和为:{{ sum }}</h1>
    <h3>当前求和放大十倍为:{{ bigSum }}</h3>
    <h3>{{ school }}学习{{ subject }}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
import {mapState,mapGetters} from 'vuex'

export default {
  name: "Count",
  data() {
    return {
      n: 1,
      // sum: 0
    }
  },
  computed: {
    /*   sum() {
         return this.$store.state.sum;
       },
       school() {
         return this.$store.state.school;
       },
       subject() {
         return this.$store.state.subject;
       },*/
    // 借助mapState生成计算属性, 从state中读取数据(对象写法)
    // ...mapState({sum: 'sum', school: 'school', subject: 'subject'}),
    // 借助mapState生成计算属性, 从state中读取数据(数组写法)
    ...mapState(['sum', 'school', 'subject']),
    ...mapGetters(['bigSum'])
  /*  bigSum() {
      return this.$store.getters.bigSum;
    },*/
  },
  mounted() {
  },
  methods: {
    increment() {
      // this.sum += this.n
      this.$store.commit('JIA', this.n)
    },
    decrement() {
      // this.sum -= this.n;
      this.$store.commit('JIAN', this.n)
    },
    incrementOdd() {
      // if (this.$store.state.sum % 2 === 0) {
      //   this.$store.dispatch('jia', this.n)
      // }
      this.$store.dispatch('jiaOdd', this.n)
    },
    incrementWait() {
      // setTimeout(() => {
      //   this.$store.dispatch('jia', this.n)
      // }, 500)
      this.$store.dispatch('jiaWait', this.n)
    }

  }
}
</script>

<style scoped>

</style>